US 12,453,289 B2
Piezoelectric actuator
Satoshi Takeuchi, Kawasaki (JP); and Kazuki Tanaka, Kirishima (JP)
Assigned to KYOCERA CORPORATION, Kyoto (JP)
Appl. No. 17/783,491
Filed by KYOCERA Corporation, Kyoto (JP)
PCT Filed Dec. 4, 2020, PCT No. PCT/JP2020/045207
§ 371(c)(1), (2) Date Jun. 8, 2022,
PCT Pub. No. WO2021/117626, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-223798 (JP), filed on Dec. 11, 2019.
Prior Publication US 2023/0010598 A1, Jan. 12, 2023
Int. Cl. H10N 30/88 (2023.01); H10N 30/50 (2023.01); H10N 30/80 (2023.01)
CPC H10N 30/883 (2023.02) [H10N 30/50 (2023.02); H10N 30/80 (2023.02); H10N 30/88 (2023.02)] 9 Claims
OG exemplary drawing
 
1. A piezoelectric actuator comprising:
a piezoelectric element having a longitudinal direction;
a case configured to house the piezoelectric element inside, the case comprising
a lid portion,
a bottom portion, and
a tubular portion comprising a plurality of bent portions in the longitudinal direction, the plurality of bent portions each being configured to bend in response to extension and contraction of the piezoelectric element; and
a strain gauge positioned at the tubular portion at a bent portion of the plurality of bent portions.